KIA Niro: Pressure Source Unit Repair procedures
Pressure Source Unit Components and components location
Warning
PSU (Presser Source Unit) must not be disassembled.
- Pressure Source Unit (PSU)
- Pressure Source Unit (PSU) connector
- Motor
- Filler adapter
- Bracket
- Accumulator
Removal
Warning
The following section describes how to diagnose faults using a diagnostic instrument.
1) Connect self-diagnosis connector (16pins) located under the driver side crash pad to self-diagnosis device, and then turn the self-diagnosis device after key is ON.
2) Select the "vehicle model" and "ESC/AHB" on KDS vehicle selection screen.
3) Select the "High Pressure Release Mode" on KDS screen, then select OK.
4) Proceed with the test according to the screen instructions.
- Turn ignition switch OFF and disconnect the negative (-) battery terminal.
- Remove the air cleaner assembly.
(Refer to Engine Mechanical System - "Air Cleaner")
- Remove the brake fluid from the master cylinder reservoir with a syringe.
Warning
Do not spill brake fluid on the vehicle as it may damage the paint. If brake fluid comes in contact with the paint, wash off immediately with water.
- Remove the connector and wire ring bracket.
- Loosen the pressure source unit (PSU) flare nut (A) and then remove the tube.
Tightening torque: 12.7 - 16.7 N*m (1.3 - 1.7 kgf*m, 9.4 - 12.3 lb*ft)
- Disconnect the pressure source unit (PSU) connector (A) and hose (B).
- Remove the sub frame.
(Refer to Suspension System - "Sub Frame")
- Loosen the nuts and bolt and then remove the pressure source (PSU).
Tightening torque: 19.6 - 29.4 N*m (2.0 - 3.0 kgf*m, 14.5 - 21.7 lb*ft)
Installation
- Installation is the reverse of removal.
- Check the brake pedal operation.
- After filling the brake fluid in the reservoir, perform the air bleed.
(Refer to the Brake system - "Brake Bleeding Procedure")
- Conduct the pedal traval sensor (PTS) calibration.
(Refer to the Brake System - "Brake Pedal")
- Conduct the pressure sensor calibration.
Diagnostic Procedure Using a Diagnostic Instrument
The following section describes how to diagnose faults using a diagnostic instrument.
- Connect self-diagnosis connector (16pins) located under the driver side crash pad to self
- Select the "vehicle model" and "ESC/AHB" on KDS vehicle selection screen.
- Proceed with the test according to the screen instructions.
Pressure Sensor Calibration
Pedal Travel Sensor (PTS) Calibration
READ NEXT:
Brake Line
Brake Line Components and components location
Removal
Disconnect the brake fluid level switch connector, and remove the
reservoir cap.
Remove the brake fluid from the master cylinder reservoir with a
syringe.
Warning
Do not spill
Brake Pedal
Brake pedal member assembly
Stop lamp switch
Brake pedal arm
Brake pedal pad
Brake pedal stroke sensor
Removal
Turn ignition switch OFF and disconnect the negative (-) battery
terminal.
Remove the crash pad lower panel.
(
Front Disc Brake
Front Disc Brake Components and components location
Bleed screw
Caliper body
Pad inner shim
Brake pad
Pad return spring
Caliper carrier
Pad retainer
Removal
Remove the wheel & tire.
Remove the caliper hose bracket bol
SEE MORE:
Resuming smart regeneration system
To re-activate the Smart Regeneration
System while driving,
with the vehicle on, touch Settings →
Vehicle → Eco Vehicle → Smart Recuperation
on the infotainment system or
pull and hold the right side paddle
shifter for over 1 second.
T
General safety information and caution
Precautions
General Precautions
Please read the following precautions carefully before performing the airbag
system service.
Observe the instructions described in this manual, or the airbags could
accidentally deploy and cause damage or injur
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